@@ -6,10 +6,12 @@
  *
  * This file is part of ObjFW. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
+
+#include <stdarg.h>
 
 #import "OFObject.h"
 
 @class OFString;
 @class OFDataArray;
@@ -264,10 +266,20 @@
  * \param fmt A string used as format
  * \return The number of bytes written
  */
 - (size_t)writeFormat: (OFString*)fmt, ...;
 
+/**
+ * Writes a formatted string into the stream.
+ *
+ * \param fmt A string used as format
+ * \param args The arguments used in the format string
+ * \return The number of bytes written
+ */
+- (size_t)writeFormat: (OFString*)fmt
+	withArguments: (va_list)args;
+
 /**
  * Closes the stream.
  */
 - close;
 @end